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I am currently working on a possible workaround for the PulseIn function, in the meantime I don’t know if you have considered other models of ultrasonic sensors that have a pin with an analogic output and in the datasheet there’s a function that provides the relation between voltage and distance, others have a RS232 Serial Output alongside with the traditional pulse width output. With them you could use the sensor to get the distance without using the PulseIn function.
I am interested in trying your PulseIn workaround when ever you get it done. Please let me know.